It's not really a FAANG thing. I bet you've seen the memes about X days without a serious accident, or without stopping the production line. It's the equivalent in a restroom or a urinal: A place you can make sure people see key information. You can find this in many industrial sites. A call center might have reminders of core principles for how to close calls quickly, or when to escalate. A lab might have safety tips. A restaurant will remind you of hand washing. An industrial site of some important safety tip or two.

While I've not seen this in every single place I've worked, it's very common.